Calculators

Need five easy calculators to be figure out and insert in my current website which is under developed. The Link to this website is

[url removed, login to view]

Also i attached the calculators formula and the way they are goign to work. My budget for these calculators are only $50 since they seem difficult but they are easy and based on just one calculator. I will help the programmer to understand it

I have developed web applications in my former job at an academic library and on a contract basis. I also have minors in Mathematics and Statistics so I feel more than able to convert these formulas into a web-based cPlus